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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary schedule of stock option activity
Option activity for the six months ended September 30, 2013 was as follows:
 
Shares
 
Weighted Average Exercise
Price
 
Weighted Average
Remaining
Contractual Term
 
Aggregate Intrinsic Value
Options outstanding, beginning of period
1,249,585

 
$
54.90

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(40,345
)
 
35.98

 
 
 
 
Forfeited
(17,300
)
 
52.93

 
 
 
 
Expired
—

 
—

 
 
 
 
Options outstanding, end of period
1,191,940

 
$
55.57

 
7.57
 
$
40,941,289

Options exercisable, end of period
164,960

 
$
32.27

 
3.85
 
$
9,510,601
Intrinsic value of options exercised
The total intrinsic value of options exercised during the periods ended September 30, 2013 and 2012 was as follows:
 
September 30,
2013
 
September 30,
2012
Three months ended
$
1,107,812

 
$
2,210,159

Six months ended
$
2,151,214

 
$
4,949,689
Shares vesting based on the compounded annual EPS growth
The 11,139 shares will vest on April 30, 2014 based on the Company’s compounded annual EPS growth according to the following schedule:

Vesting Percentage
 
Compounded Annual EPS Growth
100%
 
15% or higher
67%
 
12% - 14.99%
33%
 
10% - 11.99%
0%
 
Below 10%
The 358,700 shares will vest as follows, if the Company achieves the following performance goals during any successive trailing four quarters during the measurement period beginning on October 1, 2012 and ending March 31, 2017:
Trailing 4 quarter EPS Target
 
Restricted Shares Eligible for Vesting (Percentage of Award)
$13.00
 
25%
$14.50
 
25%
$16.00
 
25%
$18.00
 
25%
The 70,800 shares will vest on April 30, 2015 based on the Company’s achievement of the following performance goals as of March 31, 2015:
EPS Target
 
Restricted Shares Eligible for Vesting (Percentage of Award)
$10.29
 
100%
$9.76
 
67%
$9.26
 
33%
Below $9.26
 
0%
The 15,871 shares vested on April 30, 2013
Summary of the status and changes restricted stock
A summary of the status of the Company’s restricted stock as of September 30, 2013, and changes during the six months ended September 30, 2013, are presented below:
 
Shares
 
Weighted Average Fair Value at Grant Date
Outstanding at March 31, 2013
562,456

 
$
73.32

Granted during the period
—

 
—

Vested during the period, net of cancellations
(10,563
)
 
43.04

Canceled during the period
(5,308
)
 
88.86

Outstanding at September 30, 2013
546,585

 
$
74.20

 
Share-based compensation included as a component of net income
Total share-based compensation included as a component of net income during the three months and six months ended September 30, 2013 and 2012 was as follows:

 
Three months ended September 30,
 
Six months ended September 30,
 
2013

2012
 
2013
 
2012
Share-based compensation related to equity classified awards:
 
 
 
 
 
 
 
Share-based compensation related to stock options
$
2,643,855

 
1,270,993

 
$
5,139,768

 
2,493,015

Share-based compensation related to restricted stock units
1,917,730

 
576,507

 
4,106,716

 
1,832,391

 
 
 
 
 
 
 
 
Total share-based compensation related to equity classified awards
$
4,561,585

 
1,847,500

 
$
9,246,484

 
4,325,406